> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Terry H. Gilsenan > Sent: Wednesday, June 01, 2005 5:05 AM > To: 'Asterisk Users Mailing List - Non-Commercial Discussion' > Subject: RE: [Asterisk-Users] UPS rating for SOHO asterisk box > > > I have many sites that have a 35amp Charger with 2 x 400ah > 900CCA deep cycle batteries (10 year warranty), and 1000VA inverters. > > The combination makes for perfect power and about 2.5 days > run time with my network kit whish consists of several Dlink > wifi access points, 1 xbox (hacked into a router/firewall) > and a vsat system. > > Total cost for the power kit AUD$1400 all up, and not a > single second of downtime in over a year. [...]
Yep....you can (somewhat) build your own UPS with peoperly rated equipment. As a matter of fact, most telco installations don't have "monolithic" UPS's (like you'll see in most larger datacenters....you know..the big box that says Liebert on it), they use racks of batteries with separate charging circuits. Most of the equipment runs directly off of the battery voltage, but you will find places with some inverters as well. Of course, the room is properly designed (spaced, non-combustible racks, fire detection and supression systems, etc.) and, in most jurisdictions they also have to carry one or more operational permits (current Internation Fire Code requires permitting for stationar lead-acid battery systems exceeding 50 gallons liquid capacity). > On the flipside, I have seen a ups flare when the transformer > overheated and melted the varnish, nasty! I've seen completely unmodified (although not properly maintained) UPSes as large as 5000 Va completely melt down to the point where they destroyed their own chassis, damaged the rack they were sitting in, and activated the clean-agent supression system in the rooms they were in. This was actually a big problem with one of my customers....they hadn't been maintaining their UPSes....the "replace battery" lights had been lit for months (they had all been purchased at about the same time). Within a span of about 3 months, 4 of them melted down similarly. A quick call to APC revealed that the batteries in these units were rated for about 12 monts less than they had actually been in service, and a simple battery replacement would have prevented the problem (the chassis was rated for something like 3 sets of batteries...whatever the lifespan of the batteries was....3 years I believe). So, don't do stupid things with high voltage, like modifying equipment that wasn't meant to be modified, using undersized equipment, failing to properly vent batteries, or storing your contraption on or near combustibles. It's just NOT worth the risk. Take it from someone who's pulled his share of bodies (of both the live and dead varities) out of buildings. I've seen way too many fires started by electrical system or device "modifications" similar to those described in previous posts. And most people who do things like this just never consider the life safety risk involved until its way too late. I'll get off my soap-box now and get back on topic. Daryl _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users